Sharp HT-SBW53121 Bedienungsanleitung Seite 10

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may sound distorted. We recommend that the rear surround speakers
are positioned at least 1m from your listening position and at this
distance any vocal distortion should not be noticeable. If you do notice
this behaviour, you can temporarily mute the rear surround speakers.
To do this:
Long press the on the remote control or on the soundbar to mute
the rear surround speakers. Long press again to un-mute.
Or, you can use the soundbar menu:
Navigate the soundbar's menu to select <SPKVOL>.
to select <MUTE>. Choose from ON or OFF.
Use or
NOTE:
ū The default setting is OFF. If switched ON, the rear surround speakers
will remain muted until they are unmuted, even if the system has been
in standby. Unplugging the soundbar from the mains power supply will
automatically switch muting OFF again.